Intriguingly, he suggests that the company wants to make money by selling the devices, rather than running ads.

Project Glass is a piece of hardware that wraps a videocamera and computer into a sunglasses-like package, with a display that rests slightly above one eye.

Google showed off the glasses in a skydiving stunt at Google I/O, its annual developers conference, and let developers preorder a test pair for $1,500. Parviz said Google was still working on shipping those early this year, as promised.

The purpose of Glass is twofold, Parviz said: to "allow people to connect to others with images and video" for "pictorial communications" and to "allow people to access information very, very quickly."

Augmented reality—where information is overlaid over the physical landscape—"isn't our immediate goal for Google Glass." It may come in the future.

You may use motion, voice, and touch to control Google Glass: It has "full audio in and audio out" and a touchpad, Parviz notes, and Google has "also experimented with some head gestures." Google Now, a service which anticipates searches based on contextual information like a scheduled plane flight in a user's calendar, may also play a role.

Google has built email and calendar services specifically for Glass.

"No plans for advertising" but Google is "very interested in providing the hardware."

Google is working on allowing Glass wearers to take phone calls. (Which makes sense, since the device looks a bit like an oversized Bluetooth headset.)